Collections and Generics

Question : 14 of 53

Marks: +1, -0

Given:

1. import java.util.*;
2. public class WrappedString {
3.   private String s;
4.   public WrappedString(String s) { this.s = s; }
5.   public static void main(String[] args) {
6.    HashSet < Object > hs = new HashSet < Object > ();
7.    WrappedString ws1 = new WrappedString("aardvark");
8.    WrappedString ws2 = new WrappedString("aardvark");
9.    String s1 = new String("aardvark");
10.    String s2 = new String("aardvark");
11.    hs.add(ws1); hs.add(ws2); hs.add(s1); hs.add(s2);
12.    System.out.println(hs.size()); 
13.   }
14.  }

What is the result?

0
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2
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4
Compilation fails.
An exception is thrown at runtime

Validate

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